Key term
Edexcel GCSE Combined Science Physics 1SC0
Key Concepts of Physics
Motion and Forces
Topic overviewScalar and vector quantitiesExamples of vectors and scalars, and velocitySpeed, distance, time and distance-time graphsAcceleration and the equation v squared minus u squaredVelocity-time graphs and free fallMeasuring speed in the laboratory, and typical everyday speedsNewton's first law, and investigating force, mass and accelerationNewton's second and third lawsWeight, mass and gravitational field strengthCircular motion and centripetal forceInertial mass and momentumCollisions, and force as the rate of change of momentumReaction time, stopping distance and large decelerationsFactors affecting stopping distance and reaction time
Conservation of Energy
Waves
Light and the Electromagnetic Spectrum
Topic overviewProperties of electromagnetic wavesInvestigating refraction in glass blocksThe groups of the electromagnetic spectrumThe continuous spectrum, and what our eyes can detectAbsorption, transmission and the velocity of electromagnetic wavesHow radiation is generated, and why danger rises with frequencyHarmful effects of excessive exposure to radiationUses of electromagnetic radiation
Radioactivity
Topic overviewThe atom and the size of atomsIsotopes, atomic number and mass numberRelative masses and charges of subatomic particlesElectron orbits and energy levelsForming ions, and how the atomic model changedTypes of ionising radiationBackground radiation and detecting radioactivityAlpha, beta and gamma, and their penetrating powerBeta-minus and beta-plus decayEffects of decay on atomic number and mass numberBalancing nuclear equationsActivity and the becquerelHalf-life and the randomness of decayHalf-life calculationsThe dangers of ionising radiationSafety precautions, contamination and irradiation
Energy – Forces Doing Work
Topic overviewEnergy stores and energy transfer diagramsChanging a system's energy, and measuring work doneWork done and the energy changes it causesGravitational potential and kinetic energy calculationsDissipation and wasted energyPower as the rate of energy transferThe watt, and calculating efficiency
Forces and Their Effects
Electricity and Circuits
Topic overviewThe atom, and drawing circuit diagramsSeries and parallel circuitsPotential difference and the voltmeterEnergy transferred by moving chargeCurrent, charge and measuring currentResistance and the equation V = IRResistors in series and in parallelDesigning circuits to test componentsInvestigating resistance in circuitsCurrent-potential difference graphs for componentsLight-dependent resistors and thermistorsThe heating effect of an electric currentUses of the heating effect, and the equation E = IVtPower as energy transferred per secondCalculating electrical powerEnergy transfer in domestic devices, and power ratingsDirect and alternating currentAlternating current and the UK mains supplyLive and neutral wires, earthing and fusesFuses in the live wire, mains voltages and electrical dangers
Magnetism and the Motor Effect
Topic overviewMagnetic poles, permanent and induced magnetsUses of magnetic materialsThe magnetic field around a bar magnetPlotting compasses and the Earth's magnetic fieldThe magnetic effect of an electric currentSolenoids and electromagnetsThe motor effect and Fleming's left-hand ruleThe force on a conductor in a magnetic field
Electromagnetic Induction
Particle Model
Topic overviewKinetic theory and differences in densityCalculating density, and investigating itChanges of state and internal energySpecific heat capacitySpecific latent heat and thermal insulationInvestigating the specific heat capacity of waterGas pressure and the motion of particlesAbsolute zero and the kelvin scale
Motion and Forces
Inertial mass and momentum
- 3 things to know
- Paper 5
Overview
Inertial mass as a measure of how hard it is to change velocity and as force divided by acceleration, then momentum as mass × velocity, its unit kg m/s, calculations with it and why it is a vector.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
State how inertial mass is defined in terms of force and acceleration.
Numbers
Calculate the inertial mass of an object that accelerates at 4 m/s² when a resultant force of 30 N acts on it.
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is meant by the inertial mass of an object?
Model answer
Inertial mass is a measure of how difficult it is to change the velocity of the object.
- 2
State how inertial mass is defined in terms of force and acceleration.
Model answer
Inertial mass is the ratio of the force applied to the acceleration it produces.
- 3
Calculate the inertial mass of an object that accelerates at 4 m/s² when a resultant force of 30 N acts on it.
Model answer
30 ÷ 4 = 7.5 kg.
- 4
Two trolleys are given the same resultant force and one accelerates less than the other. Compare their inertial masses.
Model answer
The trolley with the smaller acceleration has the greater inertial mass.
- 5
Explain why a loaded lorry is harder to get moving from rest than an empty one.
Model answer
The loaded lorry has a greater inertial mass, so a larger force is needed for the same acceleration.
- 6
Explain how measuring an acceleration allows the inertial mass of an object to be found.
Model answer
The known resultant force is divided by the measured acceleration to give the inertial mass.
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